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In quantum physics and in particular in the context of quantum computing a linear map between spaces of linear operators (hence an “operator on operators”) is sometimes called a superoperator.
Notably density matrices representing quantum states are given by linear operators and a quantum operation is a superoperator that preserves the defining properties of density matrices. (Beware that sometimes different or no distinctions between “quantum operation” and “superoperator” are made.)
Created on January 20, 2014 at 15:47:21. See the history of this page for a list of all contributions to it.